Differentiate w.r.t. x_1561
2x_{1561}
Evaluate
x_{1561}^{2}
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2x_{1561}^{2-1}
The derivative of ax^{n} is nax^{n-1}.
2x_{1561}^{1}
Subtract 1 from 2.
2x_{1561}
For any term t, t^{1}=t.
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